Energy, A Self-Administered Test (Modified True or False, 50 Items)

Wind is the second most abundant energy on earth. Wind turbine in Bangui, Ilocos Norte.One turbine can generate enough electricity

Here is a practical set of questions to guide you in teaching general science, in helping you answer some of the most common queries about energy. You may download this lesson, print, share with your family and friends. You may come up with a term paper based on this lesson. The answers are provided at the end of the lesson.

1. You need less energy to boil water on the lowland (sea level) than on the highland (mountaintop).

2. When water boils at sea level, and you want to increase the temperature, all you need to do is burn more fuel, and even prolong it.

3. The temperature of boiling water inside a pressure cooker can be raised above 100ºCelsius.

4. It is cooler on the mountain top than on the lowland, because the air is thinner.

5. One-half of the fossil fuels we use for heating, in generating electricity, and running our machines is actually lost; it’s really a waste of energy.

6. All over the world, the contribution of each of these main energy sources is as follows: oil and gas 35 %, coal 60%, nuclear 5%.

7. Worldwide, eighty (80) percent of energy used for cooking comes from firewood.

8. Under normal condition, firewood smoke is generally harmless to health and the environment. If fact smoke from firewood drives pest and other vermin, induces flowering and fruiting of fruit trees.

9. The most popular local firewood comes from madre de cacao (Gliricida sepium) and ipil-ipil (Leucaena glauca).

10. Firewood farming can be integrated into the forestry program, mixed tree farming, strip and contour farming. It helps reduce erosion and siltation.

11. SALT means Sloping Agricultural Land Technology, a program of the DA and DENR to protect our hillsides and uplands.

12. Forests, irrespective of its kind and location, increase supply of O², absorb CO² from the air, create a mini-climate, attract cloud and increase rainfall.

13. Biofuel refers to energy derived from farm wastes, oil from plants such as Jatropha, consuelda, castor bean, lumbang, bitaog, and the like.

34. Among the alternative sources of oil which are being investigated in the light of spiraling oil price, are the following species of Family Euphorbiaceae, to which the rubber tree belongs.• Soro-soro (Euphorbia neriifolia),• Gatas-gatas (E. pilulifera),• Consuelda (E. tirucalli),• Physic nut (Jatropha curcas),• Castor-oil plant or tangantangan (Ricinus communis)

35. The ultimate source of energy is the sun, either directly or indirectly.

36. Starlight (other than our sun, of course) can be harnessed as source of power.

37. We have succeeded in inventing the “Perpetual Machine,” a long dream of mankind. Eliminating friction means tremendous energy saving.

38. The human body is a perfect machine in terms of energy conservation and utilization, which no human invention can compare.

39. There are now hydrogen powered car running on the streets – the promise to replace fossil fuels.

44. Prisoners become emaciated when, due to prolonged and extreme lack of food, the body converts adipose and muscle tissues into energy.

45. The nemesis of moving parts that reduce fuel efficiency is friction.

46. Synergy means there is "more energy than the sum of its parts."

47. The ultimate end result when energy is transformed from one form to another is low level heat.

48. Energy is neither created nor destroyed.

49. A single lightning bolt, if only it can be stored, is enough to light a community for days.

50. Overall conclusion and recommendation in conserving energy can be summarized into“Less is More”

ANSWERS1. False, at sea level water boils at 100ºC; 3,000m – 90ºC; 6,000m – 81ºC; 9,000m – 75ºC)2. False, Water boils at 100ºC, and remains at this temperature, water will simply change from liquid to gaseous form – steam.3. True, usually at 120ºC for typical pressure cookers.4. True. Air absorbs and conserves heat. There is less air at higher elevation.5. True. 50% is wasted6. False. Oil and gas 60%, coal 35% nuclear 5%7. True. In rural communities firewood is the main cooking fuel.8. True. Environment-friendly. Too much exposure is harmful though. It could lead to resource depletion.9. True. in the Philippines, or where these trees grow in abundance.10. True11. True12. True. Forests provide food, energy, shelter and serve as wildlife sanctuary. They also “catch” smog (suspended layer of fog and smoke).13. True14. False. Alcohol and gasoline15. True16. False, computation is based on 1 billion cars.17. False18. False. New sails can replace engine power.19. True20. False. There are pioneer projects such as gully wave generator, wave power, OTEC Ocean Thermal Energy Conversion, CLAM – British wave pressure system, Japanese osmosis system at estuaries.21. True. Recycle water, wood waste, scrap metal, used tires, plastics. Of all recycled metals, aluminum has the highest recovery.22. False, exaggerated data. But practice energy conservation, such as fewer and more efficient light bulbs, limit laundry (ex. sun dry, bulk washing and ironing), limit using electricity in bath, pressurized water system)23. True. There are 500 nuclear plants all over the world – now there is a slowdown for new ones. France, Germany, Belgium and Japan will produce more electricity from nuclear reactors24. True25. True26. True. It is also important in the development of fisheries and forestry in the area.27. True28. True29. False30. True. But there are only 20,000 wind turbine generators (WTGs) in the world with 15,000 located in California. Total production is only 5,000 MW.31. True32. True33. True34. True. Anglo-French link – the Old Red Sandstone – produces 76 ºcentigrade, hot enough to heat buildings. We tap volcanic heat at Los Baños, Laguna, and in Tiwi, Albay.34. True. However, many of these potential energy sources are in the pioneering stage of development.35. True. Including fossil fuels, wind and water energy.36. True, potentially, that is. Imagine how dark the night is without stars.37. False. The rule is, “energy in, energy out.” We still have to solve friction, decay, imprecision, etc.38. True39. False. By and large, the Hydrogen engine is still on experimental stage.40. True. Magnetic lines run from South Pole to North Pole, creating beautiful aurora borealis and aurora austalis41. False. Energy consumption takes place at very low rate.42. True43. False. Hydrolysis before respiration/oxidation.44. True45. True46. True, say the maximum weight the left hand can lift is 20 kg and the right hand is 20 kg, both hands can lift not only 40 kg, but more - perhaps 50 kg. This does not follow the laws of physics.47. True48. True49. True. But we don’t have yet the technology to harness the energy of lightning.50. True. Conserve so that there will be enough energy for everyone.

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Award-winning author of "The Living with Nature Handbook" (Gintong Aklat Award 2003) and "Living with Nature in Our Times" (National Book Award 2008); Recipient Father Jose P Burgos Achievement Award (2016); professor, University of Santo Tomas, De La Salle University-D; former Director, National Food Authority; and Consultant on food and agriculture, Senate of the Philippines.